Addition and subtraction fact flashcards with sums to 20 and differences to 10.
I print these out on card-stock at the end of the year and have my students cut them out and create their own take home flash cards (tiny ones, to help save paper) by writing the sums/differences on the back of each card. They then get two baggies to help them separate their cards into fluent facts and practice facts. I've also included my baggie labels.
Game idea: have students play the traditional card game "war" with their flashcards